Recently, Jiangsu Institute of Technology Mechanical Engineering and Jiangsu Jinshi Machinery Group Co., Ltd. jointly undertaken by Jiangsu Province, scientific and technological project "large-caliber ball valve research and development," passed the Jiangsu Provincial Science and Technology Expert Group's identification of acceptance. The successful development of large-diameter ball valve can be widely used in petroleum, natural gas, municipal engineering gas supply, water supply and other industries. The ball valve with a new type of C-shaped metal seal ring components to ensure high-pressure seal to improve service life, hollow ball structure and sub-section stamping forming process effectively ensure the ball's machining accuracy and quality, reducing production costs. In addition, compared with the ordinary ball valve, the ball valve has the advantages of reasonable structure, corrosion resistance, good sealing performance, high safety performance and long service life, and is an ideal product in pipeline engineering at present.